231322013 has 4 divisors (see below), whose sum is σ = 249116028. Its totient is φ = 213528000.

The previous prime is 231321997. The next prime is 231322019. The reversal of 231322013 is 310223132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53553124 + 177768889 = 7318^2 + 13333^2 .

It is a cyclic number.

It is not a de Polignac number, because 231322013 - 2⁴ = 231321997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231321982 and 231322000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231322019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8896988 + ... + 8897013.

It is an arithmetic number, because the mean of its divisors is an integer number (62279007).

Almost surely, 2^231322013 is an apocalyptic number.

It is an amenable number.

231322013 is a deficient number, since it is larger than the sum of its proper divisors (17794015).

231322013 is a wasteful number, since it uses less digits than its factorization.

231322013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17794014.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231322013 is about 15209.2739142932. The cubic root of 231322013 is about 613.8642205251.

Adding to 231322013 its reverse (310223132), we get a palindrome (541545145).

The spelling of 231322013 in words is "two hundred thirty-one million, three hundred twenty-two thousand, thirteen".